Well pump



W. BRAUER Aug. 29, 1939.

WELL PUMP s sheets-sheet 1 Filed June 9, 1938 Aug. 29, 1939. w. BRAUER 2,171,171

WELL PUMP Filed June 9, 1938 .'5 Sheets-Sheet 2v gru/vwo@ Y ,3 'li: F65 f llrwwer,

Aug. ze, 1939. w BRUER 2,111,171

` WELL PUMP l Filed June 9, 1938 3 Sheets-Sheet 3 Prg' E I Patented Aug. v29, 1939 UNITED STATES PATENT OFFICE 12 Claims.

This invention relates to improvements in deep well pumps, and more particularly to a novel mechanical pump of the rotary type.

Some of the objects of the invention are to providea bottom hole hydraulic multiple plunger pump for oil wells, of simple, relatively inexpensive construction which can control the amount of fluid pumped by the rotation speed of the pump; and which is in sectional form so that sections can be added as desired to increase the production.

Another object is to furnish a compact pump that can be used in casing as small as 5%".

Afurther object is to supply a pump which can be operated by rotating the sucker rods and as such rods may be readily guided in roller bearings, the rods will be protected to a greater extent than is the case with rods that reciprocate vertically. While I prefer to use the sucker rods, it will'be apparent that any suitable string, tubing, cable, etc., may be 'employed to rotate the rotor of the pump.

Another object is to provide a pump which may be driven from the top of the well and the construction is such that the pump can be put on tubing, runn the well and set with a tubing catcher. n Afterwards the rods can be run in the tubing and engaged in driving connection with the rotor of the pump. Subsequently, the rod string may be picked up enough to take the Y weight of the rods oi the pump. Then the rods can be supported in such position by a thrust bearing by a rotor on the top of the well so that the pump will only have rotation strain.

A further object is to supply a pump so constructed that all parts run in oil all the time. Even should the uid be lowered below the in'- take valves, the oil in the tubing will always take care of all moving parts in the pump and sucker guide bearings.

With the foregoing objects outlined and with other objects in view which will appear as the description proceeds, the invention consists in the novel features hereinafter described in detail, illustrated in the accompanying drawings, and more particularly pointed out in the appended claims. Y

In the drawings:

Fig. 1 is a Vertical sectional view of the upper portion of a well employing my improved pump and showing the means for supporting and rotating the sucker rod string.

Fig. 1A is a similar view of the lower end portion of the well with my improved pump-shown therein; the pump and tubing catcher and a portion of the tubing being shown in elevation.

Fig. 2 is a vertical sectional view partly in elevation of the upper portion of the pump.

Fig. 2A is a. similar view of the medial portion of the pump- Fig. 2B is a similar view of the lower portion of the pump. f Fig.,3 is a horizontal sectional view taken on the line 3-3 of Fig. 2.

Fig. 4 is a similar view taken on the line 4--4v of Fig. 2B.

Fig. 5 is a longitudinal sectional view of one of the valves of the pump. g

Referring to the drawings, 6 designates a string of casing, 1 a string of tubing and 8 the rod string of a Well.

In accordance with the invention the rod string extends through a head 9 at the top of the well and it is supported by slips I0 on a rotary table II that may be driven by any suitable prime mover, such as an electric motor I2 which functions to rotate the rod string.

At various points along the rod string I employ anti-friction bearings I3 having radially extending WingsV I4 adapted to abut against the tubing and to center the rod string to prevent the latter from contacting with the tubing.

At the lower end of the tubing I employ a tubing catcher I5 of anyI conventional type which may be set from the top of the well in order to anchor and support the tubing.

A sleeve I6 is provided at its upper end with left-hand threads II which receive similar threads at the lower end of the tubing string as indicated at I8.

The sleeve has a threaded connection as shown at I9 with an internal tubular member 20 forming a bearing for a hollow shaft 2|. The latter is provided near its upper end with an external annular flange 22, which rests and rotates on an anti-friction bearing 23 supported by the member 20. This bearing is protected by a cup washer 24 which rests on the flange and bears against the inner surface of the sleeve I6. 'I'he washer is held in place by a gland 25 which in turn is secured to the hollow shaft by a split springfmetai ring 26.

The shaft 2l extends entirely through the member 20 and it is provided at its lower end with a lock washer 2'I and a nut 28, these elements serving lto keep the shaft in place but permitting the rotation of the shaft'. v

As best shown in Fig. 3, the bore of the shaft is provided with radially disposed inwardly extending ribs 29 serving as keys to interlock with the vanes 30 of a mandrel 3l which may be slipped into the shaft from .the upper end thereof and which will serve to rotate the shaft;

The mandrel is provided at its upper end with right-hand threads 32 by which means it is connected to the lower end of the rod string.

As heretofore mentioned, the pump proper of :ny invention is of a unitary nature so that two or more units may be hooked up endwise to take care of any desired production. The upper unit consists of a casing 33 having a threaded connection at 34a with the tubular member 20. The lower end portion of the casing 33 has .a threaded connection with a stationary cylinder 34 which in turn has a threaded connection at 35 with an intermediate casing 36; the latter having a threaded connection at 31 with the cylinder block 38 of a lower unit. The lower unit has a. casing 39 in the form of a cup which closes the lower end of the pump. The part 39 is secured by a threaded connection 40 to the cylinder 38.

Each cylinder, as best shown in Figs. 2B and 4, is provided with upper and lower bores 4l, 42 arranged in pairs parallel to its axis, and each pair consisting of a combined upper and lower bore.

In the construction illustrated there are eight cylinders in each set of bores. Between each of the aligned bores 4l, 42, I arrange a valve 43 which may be of the construction shown in Fig. 5. It, consists of a 'tubular shell 44 provided with ex ternal threads to form a. threaded connection with the cylinder. Within the shell I arrange an intake ball 46 and a discharge ball 41, and between the balls, the shell is provided with ports 48 which communicate with the bores 4l and 42.

In the bores I arrange upper and lower plungers 49 and 50, the construction being such that the plungers in each aligned set of bores move away from one another to draw liquid or oil into the bores through the ports 48 and past the valve 46 while the valve 41 remains closed. Afterwards the plungers are moved toward one another to force the liquid from the bores past the valves 41 and into an annular chamber 5| positioned within the cylinder.

A hollow shaft 52 extends through each cylinder and is provided with medial ports 53 which place the interior of the shaft in communication with the chamber 5l. Each hollow sr aft 52 (Fig. 2A) is provided at its upper end portion with a washer 54 having an inclined annular external surface 55 forming a support for the inner ring 56 of an anti-friction bearing 51 which is inclined in relation to the axis of the pump. The washer is secured against longitudinal displacement on the shaft 52 by a beveled top washer 58 and a nut 59.

A similar arrangement is. positioned at the lower end portion of each shaft 52, but the anti- .friction ring at the lower end of the shaft is inclined in a direction opposite to that of the antifriction ring at the upper end of the shaft.

These rings engage hook shaped elements 6|)v at the outer endsof the plungers and it will be obvious that rotation of the rings by means of the hollow shafts will cause the plungers to reciprocate.

Each shaft is rotatable in its cylinder and is journalled in suitable bearings 6| positioned near the ends of each cylinder.

The ends of each hollow shaft are provided with a series of spaced projecting clutch teeth 62to allow the units to be hooked up end to end and to be driven from the common shaft 2|, the latter being provided at its lower end with similar clutch teeth 63 for this purpose.

In operation, the pump after being attached to the lower end of the tubing can be run into the well, and at the desired depth the pump may be vset by operation of the tubing catcher. Then the rods are run into the tubing with the mandrel 3l a't the lower end thereof, and the mandrel is brought into driving connection with the hollow shaft 2|. Afterwards the rod string is lifted to take the weight off the pump, and the slipsv IU are adjusted so as to support the rod string by the rotary` 'Ihen the motor is operated to cause rotation of the rod string and the hollow shafts, while the pump cylinders are prevented from rotation by the tubing catcher. As the shafts rotate. the opposed plungers 49, 50 will first be moved away from one another to draw oil into the cylinder bores and then the plungers will be moved toward one another to force the oil from the bores into the hollow shafts. The oil discharged from the upper end of the shaft 2l will travel up the tubing and be discharged through pipes 64 at the top of the well.

The rotating power needed for my pump is reduced and the stroke lengthened by setting the drive angles of the anti-friction bearings 51 so that two plungers come together at the same time; that gives a one inch stroke with drive set at one quarter inch off center of right angle to drive bushing. It also takes care of sixteen plungers with eight intake and eight discharge valves. The constructionis such that in case a valve should become inoperative, it will only stop two plungers from pumping, the rest of the pump will work unless both valves go bad at once which is practically impossible in a pump of this type.

I employ small plungers with slight clearance so that no packing is needed and no sand can get between the plunger and its bore.

It will be observed that I have provided a multiple plunger pump secured to the lower end of a tubing catcher with left-hand threads and as the tubing is anchored to the casing, rotation of the shafts of the pump will not unscrew the tubing or pump. As my pump has small plungers driven by roller bearings set at angles on the drive shaft, this gives the 'same lifting power as a screw jack having, kfor example, two threads per inch, thus giving one inch stroke and allowing lthe use of a single set of check valves for two plungers.

While I have disclosed what I now consider to be a preferred embodiment of the invention so that the same may be readily understood by those skilled in the art, I am aware that changes may be made in the details disclosed without departing from the spirit of the invention as expressed -in the claims.

What I claim and desire to secure by Letters Patent is:

the bores, and connecting means at the outer ends of the plungers operatively connected to said rings for causing reciprocation of the plungers due to rotation of the driving means.

2. A deep well pump comprising a tubular cylinder having upper and lower bores arranged in pairs parallel to its axis and each pair consisting of a combined upper and lower bore, a combination intake and discharge valve structure intersecting each combined upper and lower bore and having ports communicating with the bores of the pair with which it is associated, rotatable driving means extending through the cylinder and having upper and lower anti-friction rings arranged at angles to the axis of the cylinder and at angles to each other, reciprocating plungers operating in the bores, and connecting means at the outer ends of the plungers operatively connected to said rings `for causing reciprocation of the plungers due to rotation of the driving means.

3. A deep well pump comprising a tubular cylinder having upper and lower bores arranged in pairs parallel to its axis and each pair consisting of a combined upper and lower bore, a combination intake and discharge valve structure intersecting each combined upper and lower bore and having ports communicating with the bores of the pair with which it is associated, rotatable driving means extending through the cylinder and having upper and lower rings arranged at angles to the axis of the cylinder and at angles to each other, reciprocating plungers operating in the bores, connecting means at the outer end of the plungers operatively connected to said rings for causing reciprocation of the plungers due to rotation of the driving means, and means arranged at the upper and lower end of the driving means to facilitate connecting the driving means to either a driving or driven element.

4. A deep well pump comprising a Itubular cylinder having upper and lower bores arranged in pairs parallel to its axis and each pair consisting of a combined upper and lower bore, a combination intake and discharge valve structure intersecting each combined upper and lower bore and having ports communicating with the bores of the pair with which it isassociated, rotatable driving means extending through the cylinder and having upper and lower rings arranged at angles to the axisof the cylinder and at angles to eachV other, reciprocating plungers operating in thev bores, and connecting means at the outer ends of the plungers operatively connected to said rings for causing reciprocation of the plungers due to rotation of the driving means, each end ofthe driving means being provided with clutch teeth.

5. A deep well pump comprising a tubular cylinder having upper and lower bores arranged in pairs parallel to its axis4 and each pair consisting of a combined upper and lower bore, a combination intake and discharge valve structure intersecting each combined upper and lower bore and secured to the cylinder and enclosing said rings and connecting means.

6. A deep'well pump comprising a tubular cylinder having upper and lower bores arranged in pairs parallel to its axis and each pair consisting of a combined upper and lower bore, a combination intake and discharge valve structure intersecting each combined upper and lower bore and having ports communicating with the bores of the pair with which it is associated, rotatable driving means extending through the cylinder and having upper and lower rings arranged at angles to the axis of the cylinder and. at angles to each other, reciprocating plungers operating in the bores, and connecting means at the outer ends of the plungers operatively connected to said rings for causing reciprocation of the plungers due to rotation of the driving means, said driving means being of tubular form and provided with means placing its interior incommunication with said valves whereby the driving means functions as a conduit for the pumped liquid.

7. A deep wellpump comprising a tubular cylinder having upper and lower bores arranged in pairs parallel to its axis and each pair consisting of a combined upper and lower bore, a combination intake and discharge valve structure intersecting each combined upper and lower bore and having ports communicating with the bores of the pair with which it is associated, rotatable driving means extending through the cylinder and having upper and lower rings arranged at angles to the axis of the cylinder and at angles to each other, reciprocating plungers operating in the bores, and connecting means at the outer ends of the plungers operatively'connected to said rings for causing reciprocation of the plungers due to rotation of the driving means, each valve structure comprising a shell having ports placing the same in communication with each combined upper and lower bore, and balls in the shell arranged at opposite sides of said ports.

8. A deepwell pump comprising a tubular cylinder having upper and lower bores arranged in pairs parallel to its axis and each pair consisting of a combined upper and lower bore, a combination intake and discharge valve structure intersecting each combined upper and lower bore and having ports communicating with the bores of the pair with which it is associated, rotatable driving means extending through the cylinder and having upper and lower rings arranged atangles to 'the axis of the cylinder and at angles to each other, reciprocating plungers operating in the bores, and connecting means at the outer ends of the plungers operatively connected to said rings for causing reciprocation of the plungers due to rotation of the driving means, said driving means comprising a hollow shaft having means at its medial portion placing its interior in communication with said valves, the ends of the shaft being provided with coupling means. y

9. In a structure of the character described, a well, a rotary table arranged at the top of the well and rotatable about the axis of the well, a tubing string arranged in the well, means anchoring the tubing string in the well, a pump secured to the lower end of the tubing string and having a rotary shaft, a rotary Well string, said rotary table being secured to and bearing the entire weight of said well string, and means operatively connecting the lower end of the well string to the shaft of the pump- 10. A deep well pump comprising a cylinder having upper and lower bores arranged in pairs parallel to its axis and each pair consisting of a combined upper and lower bore, passageways leading from the outer` side of the cylinder to each combined upper and lower bore, intake valves controlling said passageways, a conduit within the cylinder, other passageways leading from each combined upper and lower bore to said conduit, discharge valves arranged in the last-mentioned passageways for controlling the discharge of uid.

from each combined upper and lower bore to the conduit, rotatable driving means extending through the cylinder and having upper and lower rings arranged at angles to the axis of the cylinder and at angles to each other, reciprocating plungers operating in the bores, and connecting means at the outer ends of the plungers operatively connected to said rings for causing reciprocation of the plungers due to rotation of the driving means.

11. -In a structure of thecharacter described, a well, a rotary table arranged at the top of the well and rotatable about the axis of the Well, a tubing string arranged in the Well, means anchoring the tubing string in the well, a pump secured to the lower end of the tubing string and having a rotary shaft, a rotary well string, said rotary table being secured to and bearing the entire weight of said well string, means operatively connecting the lower end of the well string to the shaft of the pump, and bearings for the well string arranged on the latter at various elevations to prevent the well string from contacting with the tubing.

12. In a structure of the character described, a tubing string, means for anchoring the tubing string in a well, a reciprocating piston type pump secured to the lower end of the tubing string and having a rotary shaft, a rotary well string, a telescopic joint connecting the lower end of the well string to the shaft of the pump, and rotary means at the top of the well, secured to said well string and bearing the entire weight of the well string whereby the pump is relieved of the weight of the well string.

WALTER BRAUER. 

